psoas major

Origin

• bodies of the vertebrae & intervertebral disks from T12 to L5 & transverse processes of lumbar vertebrae

Insertion

• forms common insertion with iliacus muscle into the lesser trochanter of the femur

Action

• flexes hip

Innervation

• lumbar plexus (ventral rami of 1st, 2nd & usually 3rd lumbar spinal nerves

More general terms

• skeletal muscle (voluntary muscle)

Additional terms

• iliacus muscle
• iliopsoas muscle
• psoas abscess
• psoas sign